As a house party in Vallejo, Calif. dwindled, with as many as 50 teenagers milling on the sidewalk early Sunday, a brown sedan stopped on the street and two shooters within unleashed a hail of bullets into the crowd, police said.

The shooting injured nine teenagers — eight shot and one trampled by the frantic crowd. It was reported just after midnight according Lt. Kevin Bartlett, a spokesman for the Vallejo Police Department.

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Though at least two people were in critical condition after the shooting, all the victims, the youngest only 13, were stable by Sunday afternoon and expected to survive, Bartlett said.

One was shot in the torso, and another sustained a graze wound to a shoulder, he said. Others had femurs broken by bullets.

At least one of the two shooters, who sped away in the sedan, hid behind a mask, Bartlett said, adding that responding officers found several spent bullet casings on the street.

Police did not made any arrests and had not identified the two suspects, he said. Most of the teenagers described the party as uneventful in terms of fights breaking out, he said. The incident remained under investigation Sunday.

Bartlett said investigators aren’t sure if the shooting was gang-related.